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          mybatis-plus基本使用
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        <h4 id="忽略映射字段"><a href="#忽略映射字段" class="headerlink" title="忽略映射字段"></a>忽略映射字段</h4><p>某些属性不是数据库的表字段，但是又是必须使用的</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@TableField(exist = false)</span></span><br></pre></td></tr></table></figure>
<p><code>@TableField(exist = true)</code> 表示该属性为数据库字段。</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@TableName</span> <span class="comment">// 数据库表相关</span></span><br><span class="line"><span class="meta">@TableId</span> <span class="comment">// 表主键标识</span></span><br><span class="line"><span class="meta">@TableField</span> <span class="comment">// 表字段标识</span></span><br><span class="line"><span class="meta">@TableLogic</span> <span class="comment">// 表字段逻辑处理注解(逻辑删除)</span></span><br></pre></td></tr></table></figure>
<span id="more"></span>
<h4 id="全局配置主键生成策略"><a href="#全局配置主键生成策略" class="headerlink" title="全局配置主键生成策略"></a>全局配置主键生成策略</h4><p>mybatis-plus 可以配置全局的主键生成策略：</p>
<p><img src="http://localhost:4000/2020/08/12/mybatis-plus%E5%9F%BA%E6%9C%AC%E4%BD%BF%E7%94%A8/001.png" alt></p>
<p>也可以通过 bean 的属性加注解的方式设置，主键上使用 <code>@TableId</code> 注解，注解的 type 属性有 6 种选值，对应 6 种主键生成策略。</p>
<p><img src="http://localhost:4000/2020/08/12/mybatis-plus%E5%9F%BA%E6%9C%AC%E4%BD%BF%E7%94%A8/002.png" alt></p>
<p>还可以在数据库中设置该表字段的生成策略，mybatis-plus 默认使用全局唯一的数字类型。</p>
<p><strong>三种设置的优先级： 注解 &gt; 全局 &gt; 默认</strong></p>
<h5 id="IdType"><a href="#IdType" class="headerlink" title="IdType"></a>IdType</h5><div class="table-container">
<table>
<thead>
<tr>
<th style="text-align:center">值</th>
<th style="text-align:center">描述</th>
</tr>
</thead>
<tbody>
<tr>
<td style="text-align:center">AUTO</td>
<td style="text-align:center">数据库自增</td>
</tr>
<tr>
<td style="text-align:center">INPUT</td>
<td style="text-align:center">自行输入</td>
</tr>
<tr>
<td style="text-align:center">ID_WORKER</td>
<td style="text-align:center">分布式全局唯一 ID 长整型类型</td>
</tr>
<tr>
<td style="text-align:center">UUID</td>
<td style="text-align:center">32 位 UUID 字符串</td>
</tr>
<tr>
<td style="text-align:center">NONE</td>
<td style="text-align:center">无状态</td>
</tr>
<tr>
<td style="text-align:center">ID_WORKER_STR</td>
<td style="text-align:center">分布式全局唯一 ID 字符串类型</td>
</tr>
</tbody>
</table>
</div>
<h5 id="在Oracle-数据库中使用-自增策略"><a href="#在Oracle-数据库中使用-自增策略" class="headerlink" title="在Oracle 数据库中使用 自增策略"></a>在Oracle 数据库中使用 自增策略</h5><ol>
<li><p>需要创建 <code>OracleKeyGenerate</code> 的 bean</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@Configuration</span></span><br><span class="line"><span class="keyword">public</span> <span class="keyword">class</span> <span class="title class_">Configuration</span>() &#123;</span><br><span class="line">    </span><br><span class="line">    <span class="meta">@Bean</span></span><br><span class="line">    <span class="keyword">public</span> OracleKeyGenerate <span class="title function_">oracleKetGenerate</span><span class="params">()</span> &#123;</span><br><span class="line">        <span class="keyword">return</span> <span class="keyword">new</span> <span class="title class_">OracleKetGenerate</span>();</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
</li>
<li><p>在配置文件 application.yml 中配置策略</p>
<p><img src="http://localhost:4000/2020/08/12/mybatis-plus%E5%9F%BA%E6%9C%AC%E4%BD%BF%E7%94%A8/003.png" alt></p>
</li>
<li><p>在实体类中添加注解</p>
<p>序列注解 <code>@KeySequence</code></p>
<p>id注解 <code>@TableId</code></p>
<p><img src="http://localhost:4000/2020/08/12/mybatis-plus%E5%9F%BA%E6%9C%AC%E4%BD%BF%E7%94%A8/004.png" alt></p>
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